Many out there, myself included, have stated that the BMW 1 Series M-Coupe is the best modern BMW money can buy, and one that, with such limited numbers in the US, will certainly go up in value. But what if you modify it? Steve Dinan's S3.R, with 444 HP and 450 lb/ft of torque may not be collector-focused, but when it comes to driving, its a monster pile of win.